This might seem like over-kill at first, but I've been running the Enterprise version of http://www.xwiki.org on my laptop, and couldn't be happier. Its served up using Jetty, and starts up automatically when I login. I like using tools that I know will scale well in the future, should the need arise (no reason why you couldn't run it on a free Heroku instance, if it handles the load, and it should, as it just idles along most of the time).
It has a Code Macro plugin that supports Pygments syntax highlighting. It all comes down to how you structure the wiki (I often turn to Wikipedia for help with that). I've been an Engineer for 20 years, and the info-flood doesn't really end, unless you dial back your enthusiasm. I like to document the tools and services I discover so that I know what's valuable, and what's out there, should I ever need them.
Once installed, its very easy to create new pages and edit them. Plus there are hundreds of plugins.